Improvement in valve-gear for oscillating engines



UNITED STATES PATENT OFFICE.

HENRY T. CARTER, OF PORTLAND, MAINE.

IMPROVEMENT IN VALVE-GEAR FOR OSCILLATING ENGINES.

Specilication forming part of Letters Patent No. 53,570, dated April 3, 1866.

To all 'whom it may concern:

Be it known that I, HENRY T. CARTER, of Portland, in the county of Cumberland and State of Maine, have invented a new and useful Improvement in the Valve-Gear for Oscillating Engines; and I hereby declare the following to be a full, clear, and exact description ot the same, which will enable others skilled Vin the art to make and use my invention, reference being made to the accompanying drawings, forming a partot' this specification, in which- Figure 1 shows a side elevation of a cylinder embodying my improvement; Fig. 2, a longitudinal section of the steam-chest, showing the toothed racked valve and segmentgear therein.

My invention consists in the combination of a rocking valve-stem, an arm, and a stud or link upon the trunnion-box cap, for the purposes and as by the description hereinafter following` more fully appears.

In1 `ig.1,A shows acylinder, which oseillates upon trunnions T. The rock-shaft S passes transversely through the steam-chest C, and operates the valve by means of the toothed segment and rack. In the steam-chest there is a plain three-ported seat, upon which the valve is caused to move. Outside the chest, the rock-shaft S carries the arm c connected with the stationary slotted link b.

The oscillation of the cylinder alternately opens and closes the induction-ports by means ot' the stationary link, arm, rock-shaft, segment-gear, and toothed rack on the back of the valve.

I am aware of the grant of Letters Patent to Marcus D. Du Bois, May 22, 1865, and numbered 12,904; but my invention differs from the subject-matter of said patent in the following particulars, to wit: In furnishing` the rock-shaft S with a single arm, while in the patent above cited it carries two three-armed levers; in dispensing with the use ot` a fixed stud and arms, by which the oscillation opens the ports, and of two spring-catches to close the same; in not employing two other arms to strike two iixed pieces to insure the closing of the ports when the valve has a short throw.

Greater simplicity and economyin construction is obtained by the employment of a single arm and the slotted link.

It the steam-chest were placed on the bottom ot' the cylinder, the piston would move in a direction contrary to that indicated by the arrows, the position of the cylinder being the same.

The throw of the valve is controlled by the length of the arm a. In proportion as the arm is shortened and the slotted link lengthened, the transit ofthe arm is enlarged.

This valve-gear can be applied to any oscillating engine, whether the cylinder oscillates upon a vertical or horizontal axis.

I do not claim to be the irst inventor of apl ino the toothed rack segment-@tear rock- .Y a 1 e t 1 shaft, and arm to an oscillating engine; but

What I do claim, and desire to secure by Letters Patent, is-

The rocking valve-stem S, arm c, in combination with a slotted link upon the trunnionbox cap, in the manner and for the purposes herein set forth.

vHENRY T. CARTER.

Witnesses:

J. F. RICHARDSON, WILLIAM H. CLIFFORD. 

